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ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me<sub>2</sub>Si(3-t-Bu-5-MeC<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrCl<sub>2</sub>

ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me2Si(3-t-Bu-5-MeC5H2)2ZrCl2

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WIESENFELDT, Helga, Annette REINMUTH, Elke BARSTIES, Kaspar EVERTZ, Hans-Herbert BRINTZINGER, 1989. ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me2Si(3-t-Bu-5-MeC5H2)2ZrCl2. In: Journal of Organometallic Chemistry. 369(3), pp. 359-370. ISSN 0022-328X. eISSN 1872-8561. Available under: doi: 10.1016/0022-328X(89)85186-1

@article{Wiesenfeldt1989ansam-23958, title={ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me2Si(3-t-Bu-5-MeC5H2)2ZrCl2}, year={1989}, doi={10.1016/0022-328X(89)85186-1}, number={3}, volume={369}, issn={0022-328X}, journal={Journal of Organometallic Chemistry}, pages={359--370}, author={Wiesenfeldt, Helga and Reinmuth, Annette and Barsties, Elke and Evertz, Kaspar and Brintzinger, Hans-Herbert} }

Evertz, Kaspar Brintzinger, Hans-Herbert deposit-license Wiesenfeldt, Helga 2013-08-13T09:20:49Z The formation of racemic and meso diastereomers of the disubstituted ansa-zirconocenes (CH<sub>3</sub>)<sub>2</sub>Si(1-C<sub>5</sub>H<sub>3</sub>-3-R)<sub>2</sub>ZrCl<sub>2</sub> (R = t-butyl, trimethylsilyl, α,α-dimethylbenzyl and 1-phenylcyclohexyl) from dimethylsilanediyl-bridged, symmetrically substituted bis-cyclopentadienyl dianion derivatives and ZrCl<sub>4</sub>·2THF has been studied under a variety of conditions. Rac/meso ratios close to 1 were obtained in all cases. Similar product ratios were observed for analogous titanium and hafnium complexes with R = trimethylsilyl. A significant increase in the rac/meso product ratio was observed when an additional substituent was present next to the dimethylsilyl bridge as in (CH<sub>3</sub>)<sub>2</sub>Si(1-C<sub>5</sub>H<sub>2</sub>-3-R-5-CH<sub>3</sub>)<sub>2</sub>ZrCl<sub>2</sub> (R = CH(CH<sub>3</sub>)<sub>2</sub>, C(CH<sub>3</sub>)<sub>3</sub>). It is suggested that intermediates with one η<sup>1</sup>-bound ring ligand control the stereochemical course of the ansa-metallocene formation. The crystal structure of R,S-(CH<sub>3</sub>)<sub>2</sub>Si(1-C<sub>5</sub>H<sub>2</sub>-3-C(CH<sub>3</sub>)3-5-CH<sub>3</sub>)<sub>2</sub>ZrCl<sub>2</sub> is reported. eng Wiesenfeldt, Helga 2013-08-13T09:20:49Z ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me<sub>2</sub>Si(3-t-Bu-5-MeC<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrCl<sub>2</sub> Reinmuth, Annette Journal of Organometallic Chemistry ; 369 (1989), 3. - S. 359-370 Brintzinger, Hans-Herbert Barsties, Elke 1989 Reinmuth, Annette Barsties, Elke Evertz, Kaspar

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